add worker-based precalculation of cashbook-values

mixin.py

@@ -3,7 +3,7 @@
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
-from trytond.model import fields, Index
+from trytond.model import fields
 from trytond.pyson import Eval, Bool, Or
 from trytond.pool import Pool
 from trytond.modules.currency.ir import rate_decimal
@@ -196,25 +196,3 @@ class SecondCurrencyMixin:
             return 2
 
 # end SecondCurrencyMixin
-
-
-class MemCacheIndexMx:
-    """ add index to 'create_date' + 'write_date'
-    """
-    __slots__ = ()
-
-    @classmethod
-    def __setup__(cls):
-        super(MemCacheIndexMx, cls).__setup__()
-        t = cls.__table__()
-        # add index
-        cls._sql_indexes.update({
-            Index(
-                t,
-                (t.write_date, Index.Range())),
-            Index(
-                t,
-                (t.create_date, Index.Range())),
-            })
-
-# end MemCacheIndexMx